Symptoms of tapeworm infection
Most tapeworms live in the small intestine of the final host, the cat. Heavy infestations in this area may cause diarrhoea, occasionally vomiting when large sections of the tapeworm may be vomited, unthriftiness and weight loss. More commonly low infestations can ocasionally cause anal irritation with the cat licking and chewing around the anal area or scooting (dragging backside along the ground). This is due to expulsion of the tapeworm segments which due to their sticky nature often attach to the skin and hair around the backside. When they first emerge they have a pearlescent white colour and contract along their length looking at times like a miniature dumb-bell. The contractions of the segment are highly irritating to the cat. After a while they dry and shrivel. A lot of people compare them with a grain of rice which changes from white to yellow with time.

also, a web site I can refer to would also be helpful, although not necessary.
thanks!